Update authors on SDK package metadata

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix
/kind release

What this PR does / Why we need it:

Switch from Google to "Agones Contributors"

This was the last reference to Google I could find.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

Let me know if you don't like "Agones Contributors" to an author, but couldn't think of anything better.

[agones-bot]

Build Succeeded 🥳

Build Id: 65ffc1e5-de7b-4605-9d45-6573f4a8d9b6

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.58.0-dev-b96d500
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.58.0-dev-b96d500
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.58.0-dev-b96d500-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.58.0-dev-b96d500
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.58.0-dev-b96d500
• image: us-docker.pkg.dev/agones-images/ci/agones-processor:1.58.0-dev-b96d500
• Linux C++ SDK (build): agonessdk-1.58.0-dev-b96d500-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.58.0-dev-b96d500.zip

A preview of the website (the last 30 builds are retained):

• https://b96d500-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4558/head:pr_4558 && git checkout pr_4558
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.58.0-dev-b96d500

[igooch]

lgtm